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CHAPTER 11 CONTROL SUB FUNCTIONS
11
11.6 Speed Change Function
(c) New speed and " Speed limit value"
When the value set in " New speed value" exceeds " Speed limit value", the positioning is operated
at " Speed limit value".
(d) Successive speed changes
To change speed successively, set an interval of 10ms or more between each speed change. If there are not
enough intervals between speed changes, the QD73A1 may not be able to follow the requests and process the
commands normally.
(e) When "0" is set in " New speed value"
When "0" is set in " New speed value" and a speed change is requested, the axis stops. Though, BUSY
signal (X14) stays on. (Inputting Stop signal turns off BUSY signal (X14).)
To activate the axis again, set a value other than "0" in " New speed value" and request the speed
change.
(3) Data setting and the execution condition of the function
The following table lists the data to be set and the condition to execute the speed change function.
Setting item Setting range Default value
Execution condition of the speed
change function
Buffer
memory
address
(decimal)
New speed
value
0 to " Speed limit
value" (pulse/s)
(Maximum 4000000
pulse/s)
0pulse/s
BUSY signal (X14) must be on. Note that
speed cannot be changed at the following.
• After the start of automatic deceleration
• After the input of Stop signal (Y27) or Stop
signal (STOP)
• After a JOG start signal (Y24, Y25) was
turned off during JOG operation
• During OPR
82
83
Speed
change
request
1: Change speed 0 91
Pr.5
Cd.2
Pr.5
Pr.5
Cd.2
Cd.2
Cd.2
Executed by the QD73A1
Positioning operation
BUSY signal
(X14)
Cd.8
Speed change request
Cd.2
New speed value 1000
ON
OFF
Positioning start signal
(Y21 to Y23)
ON
OFF
OFF
ON
0
t
v
Cd.2
Pr.5
Cd.8